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Ampicillin for infections

Penbritin

Make sure you tell your doctor if you are allergic to penicillin. Ampicillin is a type of penicillin - do reportado tómelo si eres alérgico a la penicilina.

Space your doses out evenly over the day and complete the full course of the antibiotic, even if you feel your infection has cleared up. You should take ampicillin when your stomach is empty of food (so an hour before you eat, or two hours afterwards).

Si tiene una reacción alérgica (como hinchazón alrededor de la boca, dificultades para respirar o una erupción roja), contacte a un médico de inmediato.

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About ampicillin

Tipo de medicamento

A penicillin antibiotic

Usado para

Infections (in adults and children)

Disponible como

Capsules, oral liquid medicine and injection

Ampicillin is given to treat a bacterial infection. It is mainly prescribed for sinus y infecciones respiratorias, urine infections, and recurrentes. It is a penicillin antibiotic which treats infection by killing the germs (bacteria) responsible for the infection.

Some medicines are not suitable for people with certain conditions, and sometimes a medicine can only be used if extra care is taken. For these reasons, before you start taking ampicillin it is important that your doctor knows:

  • If you suspect you may have glandular fever (the symptoms are high temperature (fever), sore throat, swollen glands).

  • If you have an allergic condition, or if you have ever had an allergic reaction to a medicine. This is especially important if you have ever had a bad reaction to any penicillin antibiotic.

  • Si tienes algún problema con el funcionamiento de tus riñones.

  • If you are pregnant or breastfeeding. Ampicillin is not known to be harmful to babies; however, it is still important that you tell your doctor if you are expecting or breastfeeding a baby.

  • Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.

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  • Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about ampicillin and will provide you with a full list of the side-effects which you may experience from taking it.

  • Take ampicillin exactly as your doctor tells you to. It is usually taken four times a day, every six hours. Your doctor or pharmacist will tell you how you should take the medication, and this information will be printed on the label of the pack to remind you. It is important that you space out the doses evenly during the day. Swallow the capsules with a drink of water.

  • You should take ampicillin when your stomach is empty, which means taking your doses one hour before you eat any food, or waiting until two hours afterwards. This is because your body absorbs less ampicillin after a meal, which means the medicine is less effective.

  • If you have been given liquid medicine for a child, read the directions carefully to make sure you measure out the correct amount of medicine.

  • If you forget to take a dose, take one as soon as you remember. Try to take the correct number of doses each day, but do not take two doses at the same time to make up for a forgotten dose.

  • Even if you feel your infection has cleared up, keep taking the antibiotic until the course is finished (unless a doctor tells you to stop). This is to prevent the infection from coming back.

  • Antibiotics are prescribed in short courses of treatment. Your doctor will tell you how long your course of treatment will last - this is not usually for longer than 14 days. If you still feel unwell after finishing the course, go back to see your doctor.

  • Some people develop redness and itching in the mouth or vagina (thrush) after taking a course of antibiotics. If this happens to you, speak with your doctor or pharmacist for advice.

  • If you are taking the contraceptive 'pill' at the same time as this antibiotic, the effectiveness of the 'pill' can be reduced if you have a bout of being sick (vomiting) or diarrhoea which lasts for more than 24 hours. If this should happen, ask your doctor or pharmacist for advice about what additional contraceptive precautions to use over the next few days. There is no need to use additional precautions for any bouts of sickness or diarrhoea which last for less than 24 hours.

  • Ampicillin can stop the oral typhoid vaccine from working. If you are due to have any vaccinations, make sure the person treating you knows that you are taking this antibiotic.

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Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with ampicillin. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.

Common ampicillin side-effects (these affect fewer than 1 in 10 people)

¿Qué puedo hacer si experimento esto?

Sentirse mal (náuseas) o estar enfermo (vómitos)

Mantente con alimentos simples

Diarrea

Drink plenty of water to replace any lost fluids. If the diarrhoea continues, becomes severe, or contains blood, let your doctor know

de inmediato

Redness and itching in the mouth or vagina (thrush)

Speak with a pharmacist or your doctor for advice about treatment

Erupción cutánea

Let your doctor know as soon as possible as your treatment will need to be changed

Importante: if you develop an itchy rash, swollen face or mouth, or have difficulty breathing, these may be signs that you are allergic to a penicillin antibiotic.

Do not take any more of this medicine and speak with your doctor or go to your local accident and emergency department straightaway.

If you experience any other symptoms which you think may be due to the antibiotic, speak with your doctor or pharmacist for further advice.

  • Mantenga todos los medicamentos fuera del alcance y la vista de los niños.

  • Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.

  • If you have been given liquid medicine, store it in a refrigerator. It will have been made up by the pharmacy and lasts for seven days, so check the expiry date on the bottle and do not use it after this date.

Información importante sobre todos los medicamentos

Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda de inmediato al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.

Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.

Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros medicamentos.

Si vas a someterte a una operación o a un tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.

No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos por ti.

Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.

Informar efectos secundarios de un medicamento o vacuna

Si experimenta efectos secundarios, puede reportarlos en línea a través de sitio web de la Tarjeta Amarilla.

symptom checker

¿Inseguro sobre mezclar medicamentos?

Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.

Lecturas adicionales y referencias

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Historial del artículo

La información en esta página está escrita y revisada por pares por clínicos calificados.

  • Próxima revisión: 10 Mar 2028
  • 11 Mar 2025 | Última versión

    Última actualización por

    Michael Stewart, MRPharmS

    Revisado por pares por

    Sid Dajani
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